Abstract
Wheat grown in contaminated soils adjacent to a lead-zinc smelter contained higher concentrations of lead, zinc and cadmium than wheat grown on uncontaminated soils. The distribution of crop contamination closely corresponded to the distribution of contaminated soils. Heavy metal concentrations in grain did not arise by surface contamination even at sites closest to the smelter. In grain grown on polluted soils, the heavy metal concentrations did not exceed prescribed health standards, and should not present any risk to human health.
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